The Economics of Diesels: No Gain from Flying at Cruising Speed

WE conclude in this issue Mr. D. R. Pye's admirable Akroyd‐Stuart Lecture surveying the position in regard to the compression‐ignition engine, which, read in conjunction with Mr. Ricardo's able Wilbur Wright lecture published in AIRCRAFT ENGINEERING last July, gives a complete picture of where the Diesel engine stands to‐day, with fruitful suggestions of what may be expected from it tommorrow. In passing, we feel bound to call attention to the fact that the appearance of both these papers is due to funds administered by the Royal Aeronautical Society, and the standard of them affords its own tribute to the value of this branch of the Society's activities.